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This was a hundred years of racist theory that Black people were inferior and born with low class inteligence. It was a popular theory back in the days that Negroids were inferior and can only advance by mixing with Caucasoid genes. There's a list of Scientist who proposed this but all what these Scientists have claimed are now considered Pseudo scientific but even it wasn't the case it would be considered too degrading to humans.
http://en.wikipedia.org/wiki/Scientific_racism
I don't know how true is this, I can think it's mostly false but there maybe some truth. For example the people who were Black and ever had a descent civilization were the East Africans who have 40 - 62% Caucasoid DNA. And many countries with predominate African population prefer a White or Asian leader to rule their people.
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